Relative Score (0–100): 60% professional tests, 40% owner reviews.
Too close to call: Discoverer AT3 XLT and Defender LTX M/S are level at 76.
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Tests – · none yet Owners 80 · 800 reviews
“I’ve run Hankook dynapro’s, BFG ko2, Nokian outpost nat, and fallen wild peaks. Currently running Cooper discoverer AT3 XLT - they are definitely the quietest all terrains I’ve had. I would recommend them if they are available in your size - many places like simpletire or priority tire carry them.”
Tests – · 1 test Owners 78 · 10 reviews
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Reviews found online | 84 | 81 |
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Reviews found online | 84 | 81 |
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Reviews found online | 70 | 73 |
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Reviews found online | 80 | 76 |
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Reviews found online | 80 | 74 |
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Professional tests (TWG score) | – | 74 |
| Reviews found online | 77 | 78 |
| Source | Discoverer AT3 XLT | Defender LTX M/S |
|---|---|---|
| Reviews found online | 78 | 78 |
| Category | Cooper Discoverer AT3 XLT | Michelin Defender LTX M/S |
|---|---|---|
| Relative Score | 76 | 76 |
| Dry | 78 | 76 |
| Wet | 80 | 78 |
| Snow | 70 | 72 |
| Comfort | 74 | 73 |
| Noise | 72 | 69 |
| Treadwear | 72 | 76 |
| Handling | 78 | 78 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
Wet grip and treadwear start at “Important” — the two things buyers rank highest. Move the sliders and the scores update instantly.
Discoverer AT3 XLT
Defender LTX M/S
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
From Reddit, forums and review threads. Not part of our score
Community opinion of the Cooper Discoverer AT3 XLT is overwhelmingly positive, with users frequently praising its smooth ride quality, exceptional quietness on the highway, and long-term durability compared to competitors like BFG KO2 and Toyo Open Country. Drivers also appreciate its solid value and performance when towing. A few users occasionally confuse the M+S marking with the Three-Peak Mountain Snowflake rating for severe winter conditions.
“New shoes this week, Cooper Discoverer At3 XLT. I’m really impressed so far.”
“New Cooper Discoverer AT3 XLT 275/75R20 these ride way better than my old Open Country A/T II”
“Are my Discoverer AT3 XLT snow rated? Going snowboarding and roads require snow tires or chains /cables. I was looking at the sidewall of my Cooper Discoverer XLT and saw there is a small M+S next to the tire size. Is it stupid to assume these are snow rated? I'm not trying to get a ticket for not having chains if I need them, which most places seem to be sold out locally.”
Based on 8 community posts
We haven't collected enough community discussion about this tire yet.
| Attribute | A · Cooper Discoverer AT3 XLT | B · Michelin Defender LTX M/S |
|---|---|---|
| Category | Premium Touring All Season tire | All Season |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 4 | — |
| Rim diameters | 16″ – 20″ | — |
| Tread depth | 16 - 18/32″ | — |
| Treadwear warranty | 60,000 mi | — |
| Sidewall | Black Side Wall - Raised White Lettering | — |
| Max pressure | 35 - 80 psi | — |
Cooper Discoverer AT3 XLT
Michelin Defender LTX M/S
Too close to call: Cooper Discoverer AT3 XLT and Michelin Defender LTX M/S are within 2 points overall. Cooper Discoverer AT3 XLT is stronger on noise. Michelin Defender LTX M/S is stronger on treadwear.
Michelin Defender LTX M/S scores 76 vs 72 on treadwear.
Cooper Discoverer AT3 XLT scores 72 vs 69 on noise.
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Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements), each result compared with every other tire in the same test and newer tests counting more. 40% comes from owner reviews found online, adjusted for how generously each site rates. Both use one scale: the average tested tire gets 70, the best 100. When a tire has only one of the two, the missing half is estimated from the other and the score stays closer to average; with no road test and fewer than five owner reviews it gets no score yet.
Community buzz from Reddit and forums is shown for context only — it never changes the score.
